US 9,808,255 B2
Embolic coil detachment mechanism with flexible distal member, resistive electrical heating element and shape memory polymer element
Juan A. Lorenzo, Davie, FL (US); and Kirk Johnson, Weston, FL (US)
Assigned to DEPUY SYNTHES PRODUCTS, INC., Raynham, MA (US)
Filed by Juan A. Lorenzo, Davie, FL (US); and Kirk Johnson, Weston, FL (US)
Filed on Mar. 30, 2012, as Appl. No. 13/436,376.
Prior Publication US 2013/0261658 A1, Oct. 3, 2013
This patent is subject to a terminal disclaimer.
Int. Cl. A61B 17/12 (2006.01); A61B 17/00 (2006.01)
CPC A61B 17/1214 (2013.01) [A61B 2017/00867 (2013.01); A61B 2017/00871 (2013.01); A61B 2017/00951 (2013.01); A61B 2017/1205 (2013.01); A61B 2017/12054 (2013.01); A61B 2017/12068 (2013.01); A61B 2017/12077 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A detachment system for delivering embolic coils to a treatment site in a vasculature of a patient, comprising:
an elongated, flexible shape memory polymer tube having a longitudinal axis, a distal portion and a proximal portion, said elongated, flexible shape memory polymer tube having a tubular wall with an inner wall surface defining an interior lumen extending through the elongated, flexible shape memory polymer tube between the distal portion and the proximal portion of the elongated, flexible shape memory polymer tube, the distal portion of the elongated, flexible shape memory polymer tube having a permanent shape and a temporary shape;
a therapeutic embolic coil releasably mounted to the distal portion of said elongated, flexible shape memory polymer tube, said embolic coil having a distal end and a proximal end;
a headpiece having a distal portion and a proximal portion, the distal portion of the headpiece being attached to the proximal end of the embolic coil, and the proximal portion of the headpiece being releasably attached within said distal portion of said elongated, flexible shape memory polymer tube, said permanent shape having an enlarged diameter configuration with an inner diameter that is larger than an outer diameter of the headpiece; and
a resistive heating element contained within the interior lumen of the distal portion of the flexible shape memory polymer tube, and disposed longitudinally along and in immediate contact with the inner wall surface of the tubular wall of the distal portion of the flexible shape memory polymer tube between the inner wall surface of said tubular wall of said elongated, flexible shape memory polymer tube and said proximal portion of said headpiece, and wherein said proximal portion of the headpiece is configured to be releasable from said distal portion of said elongated, flexible shape memory polymer tube by heating of said distal portion of the elongated, flexible shape memory polymer tube to cause said distal portion of the elongated, flexible shape memory polymer tube to change from said temporary shape having a reduced diameter configuration to said enlarged diameter configuration.